#46

backend/app/models/post.rb

@@ -35,6 +35,8 @@ class Post < ApplicationRecord
   validate :validate_original_created_range
   validate :url_must_be_http_url
 
+  def parent_posts = parents
+
   def as_json options = { }
     super(options).merge({ thumbnail: thumbnail.attached? ?
                                       Rails.application.routes.url_helpers.rails_blob_url(
@@ -46,6 +48,8 @@ class Post < ApplicationRecord
 
   def snapshot_tag_names = tags.joins(:tag_name).order('tag_names.name').pluck('tag_names.name')
 
+  def snapshot_parent_post_ids = parents.order(:parent_post_id).pulck(:parent_post_id)
+
   def related limit: nil
     ids = post_similarities.order(cos: :desc)
     ids = ids.limit(limit) if limit

backend/app/models/tag.rb

@@ -85,9 +85,9 @@ class Tag < ApplicationRecord
   def self.video = find_or_create_by_tag_name!('動画', category: :meta)
   def self.niconico = find_or_create_by_tag_name!('ニコニコ', category: :meta)
 
-  def self.normalise_tags tag_names, with_tagme: true,
-                                     with_no_deerjikist: true,
-                                     deny_nico: true
+  def self.normalise_tags! tag_names, with_tagme: true,
+                                      with_no_deerjikist: true,
+                                      deny_nico: true
     if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
       raise NicoTagNormalisationError
     end